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creating a partial thread on a cylinder face by a surface ,how nice this method is !
I did not know how to creat a partial thread on a cylinder face before ,but some day some users introduced some different methods for it by forums , like" creat a helix first, and use "transform" to move this helix,and make it twine on the cylinder face partly,another method is that "creat a surface first and then creat a helix on this surface instead of this cylinder". so today I used the second method for creating a partial thread ,it is very good.see the image below, the yellow profile lines are the surface I created!